Words That Rhyme With "Whapper" :
2 syllables:
auburn, Bacher, beeper, bleeper, blooper, bopper, caper, capper, cheaper, chipper, choper, chopper, clapper, clipper, Clopper, cooper, coper, copier, copper, Cowper, crapper, creeper, cropper, crupper, cupper, dapper, deeper, diaper, dipper, Dnieper, draper, dropper, duper, flapper, flipper, gaper, gawker, gipper, grager, gripper, grouper, hepar, Hepper, hipper, hooper, hoper, hopper, hyper, Jaipur, kapor, kapur, keeper, khaddar, Kiper, kipper, knapper, Kuiper, kupper, laager, lager, lapper, laugher, leaper, leper, lepper, lipper, looper, loper, lopper, mapper, mopper, napper, neeper, Neper, nipper, paper, pauper, peeper, pepper, piper, pipper, popper, proper, propper, raper, rapper, reaper, ripper, roper, sapor, sapper, sawder, schnapper, scooper, scraper, scrapper, scupper, shaper, shipper, shopper, sipper, skipper, slapper, sleeper, slipper, sloper, sloppier, snapper, sniper, snooper, Soper, sopor, steeper, stepper, stooper, stoper, stopper, strapper, striper, stripper, stupor, super, supper, taper, tapir, tapper, tipper, toper, Topor, topper, trapper, tripper, trooper, trouper, upper, vapor, viper, whooper, wrapper, yachter, zapper, zipper
3 syllables:
diopter, dispauper, eavesdropper, eyedropper, fiacre, improper, repaper, sharecropper, unstopper